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PDF AK4424 Data sheet ( Hoja de datos )
| Número de pieza | AK4424 | |
| Descripción | 192kHz 24-Bit Stereo DAC | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AK4424]
AK4424
192kHz 24-Bit Stereo ΔΣ DAC with 2Vrms Output
GENERAL DESCRIPTION
The AK4424 is a 5V 24-bit stereo DAC with an integrated 2Vrms output buffer. A charge pump in the
buffer develops an internal negative power supply rail that enables a ground-referenced 2Vrms output.
Using AKM’s multi bit modulator architecture, the AK4424 delivers a wide dynamic range while preserving
linearity for improved THD+N performance. The AK4424 integrates a combination of switched-capacitor
and continuous-time filters, increasing performance for systems with excessive clock jitter. The 24-bit
word length and 192kHz sampling rate make this part ideal for a wide range of consumer audio
applications, such as DVD, AV receiver system and set-top boxes. The AK4424 is offered in a space
saving 16pin TSSOP package.
FEATURES
Sampling Rate Ranging from 8kHz to 192kHz
128 times Oversampling (Normal Speed Mode)
64 times Oversampling (Double Speed Mode)
32 times Oversampling (Quad Speed Mode)
24-Bit 8 times FIR Digital Filter
Switched-Capacitor Filter with High Tolerance to Clock Jitter
Single Ended 2Vrms Output Buffer
Digital de-emphasis
Soft mute
I/F format: I2S
Master clock: 512fs, 768fs or 1152fs (Normal Speed Mode)
256fs or 384fs (Double Speed Mode)
128fs, 192fs (Quad Speed Mode)
THD+N: -92dB
Dynamic Range: 105dB
Automatic Power-on Reset Circuit
Power supply: +4.5 ∼ +5.5V
Ta = -20 to 85°C
Small Package: 16pin TSSOP (6.4mm x 5.0mm)
MCLK
SMUTE
DEM
Control
Interface
LRCK
BICK
SDTI
Audio
Data
Interface
MS0935-E-03
De-emphasis
Control
Clock
Divider
8X
Interpolator
ΔΣ
Modulator
SCF
LPF
8X
Interpolator
Charge
Pump
ΔΣ
Modulator
SCF
LPF
CP CN VEE VSS2
1μ 1μ
CVDD
-1-
VDD
DZF
VSS1
AOUTL
AOUTR
2010/09
1 page  
[AK4424]
ANALOG CHARACTERISTICS
(Ta = 25°C; VDD=CVDD = +5.0V; fs = 44.1 kHz; BICK = 64fs; Signal Frequency = 1 kHz;
24bit Input Data; Measurement frequency = 20Hz ∼ 20kHz; RL ≥5kΩ)
Parameter
min typ
max
Resolution
24
Dynamic Characteristics (Note 4)
THD+N (0dBFS)
fs=44.1kHz, BW=20kHz
-92 -84
fs=96kHz, BW=40kHz
-92 -
fs=192kHz, BW=40kHz
-92 -
Dynamic Range (-60dBFS with A-weighted. (Note 5)
98 105
S/N (A-weighted. (Note 6)
98 105
Interchannel Isolation (1kHz)
90 100
Interchannel Gain Mismatch
0.2 0.5
DC Accuracy
DC Offset
(at output pin)
-60 0 +60
Gain Drift
100 -
Output Voltage (Note 7)
1.97 2.12 2.27
Load Capacitance (Note 8)
25
Load Resistance
5
Power Supplies
Power Supply Current: (Note 9)
Normal Operation (fs≤96kHz)
Normal Operation (fs=192kHz)
Power-Down Mode (Note 10)
24 36
27 40
10 100
Note 4. Measured by Audio Precision (System Two). Refer to the evaluation board manual.
Note 5. 98dB for 16bit input data
Note 6. S/N does not depend on input data size.
Note 7. Full-scale voltage (0dB). Output voltage is proportional to the voltage of VDD,
AOUT (typ.@0dB) = 2.12Vrms × VDD/5.
Note 8. In case of driving capacitive load, inset a resistor between the output pin and the capacitive load.
Note 9. The current into VDD and CVDD.
Note 10. All digital inputs including clock pins (MCLK, BICK and LRCK) are fixed to VSS or VDD
Units
Bits
dB
dB
dB
dB
dB
dB
dB
mV
ppm/°C
Vrms
pF
kΩ
mA
mA
μA
MS0935-E-03
-5-
2010/09
5 Page 
[AK4424]
■ Analog Output Block
The internal negative power supply generation circuit (Figure 4) provides a negative power supply for the internal 2Vrms
amplifier. It allows the AK4424 to output an audio signal centered at VSS (0V, typ) as shown in Figure 5. The negative
power generation circuit (Figure 4) needs 1.0uF capacitors (Ca, Cb) with low ESR (Equivalent Series Resistance). If this
capacitor is polarized, the positive polarity pin should be connected to the CP and VSS2 pins. This circuit operates by
clocks generated from MCLK. When MCLK stops, the AK4424 is placed in the reset mode automatically and the analog
outputs settle to VSS (0V, typ).
AK4424
CVDD
Charge
Pump
Negative Power
AK4424
CP CN VSS2
VEE
Cb
(+) 1uF
1uF Ca
(+)
Figure 4. Negative power generation circuit
AOUTR
(AOUTL)
0V
2.12Vrms
Figure 5. Audio signal output
MS0935-E-03
- 11 -
2010/09
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet AK4424.PDF ] | |
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